In addition to Photo Time-stamping, you are able to add comments to photos as a watermarked stamp on the photo itself that has been populated from another form field, or as a larger comment section under the photo.
Having a comment comment stamped on the photo can only be done through the App, however adding a comment under the photo can be done through both the App and Web Portal.
To enable the watermarked comment in your Form Template > Select the Field where you would like the comment to pull from and this will be displayed on the photo > Deploy / Publish Template to save changes. (Timestamp does not have to be selected if you are not wanting the time the photo was imported or taken displayed).
If you would like a larger comment to display under the photo you will need to check Allow Comments in the Field Settings. (Photo Tag options does not need to be selected for the comment section to become available). > Deploy / Publish Template to save changes.